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A new study says world clocks need a "negative leap second" to stay accurate.

Black diamonds are extremely rare, and are found naturally only in Brazil and Central Africa. The cosmic origin theory of "The Enigma" is based on carbon isotopes and high hydrogen content.

You might recognize it from Game of Thrones or innumerable Instagram posts from visitors to the island. It fell during a powerful storm.

Mountain lions are known to be scary lone hunters, but a biologist aims to prove us wrong with thousands of videos showing the big cats in their natural habitat.

Memoirist Tara Westover talks about growing up in a survivalist household. Critic David Bianculli calls Blue Planet II a "dazzling piece of television." Richard Jenkins discusses The Shape of Water.

Anupam Jena has made a practice of looking at big data and natural experiments to ask questions others overlook. He describes how the COVID-19 pandemic could have several unexpected consequences.

America is unprepared for the next big catastrophe, whether it's like Sept. 11 or like Hurricane Katrina, the author of a new book says. Stephen Flynn, a former Coast Guard commander, says ports like the giant facility in Los Angeles, are especially vulnerable to attacks or natural disasters.

With help from a dedicated cadre of volunteers, paleontologists at the La Brea Tar Pits in the heart of Los Angeles continue to excavate the remains of saber tooth cats, dire wolves and other creatures from the Ice Age that ruled the region more than 40,000 years ago.

Commentator Ruth Levy Guyer reflects on the power of wind -- to spark life by spreading seeds, to cause disease by spreading pathogens, and to disturb the psyche. Guyer teaches courses in bioethics and infectious diseases at Haverford College.

The coalfields of the Appalachian Mountains have long hidden some of the country's greatest natural resources. For residents of the regions, they've also inspired a uniquely American strain of music. A new two-CD collection presents 48 songs about coal mining.